Canopy Structure And Light Environment Of Evergreen Broad-leaved Forest In GTS

The 2400 gropes of canopy image at the top of the subtropical evergreen broad-leaved forest 24 ha permanent details to(600 samples) in Gutianshan are obtained by the method of of hemispherical photography. We can get the canopy gap frequency below the hemispherical through colleting a signal image. It is prominental advantages no matter from the work efficiency and the error reduction. The collected image are digitized by Gap Light Analyzer(GAL) software and the graph are drawed and the data are analysed by R(3.0.2) and Microsoft Office Excel 2013 software. The feature of canopy structure and Light environment,and the trend of community update in Gutianshan are obtained by analyzing the canopy openness, the characteristics of the leaf area index and Light environment, and the influence of canopy structure Light environment, Light environment on the influence of the undergrowth species.The results as follows:1. The opening of the canopy is between 5.25% ~ 84.13%, 10% ~ 50% of the gap scores are thou farmland area main canopy structure type of 24 ha evergreen broad-leaved forest in Gutianshan.2. The leaf area index range between 0.06 ~ 5.22, he middle area index between 0.5 and 3.0 as the main type of canopy structure of 24 ha evergreen broad-leaved forest in Gutianshan.3. The leaf area index were very significant negative correlation with the opening of the canopy(R2 = 0.9408 k = 1.224, p < 0.01) * * *, forest canopy leaf Angle with the ground.4. The slope is greater than 50 ° above terrain conditions appeared the greatest gap scores 84.13% and the lobular area index of 0.06.5. Forests direct light transmission quantity range is 0.16 Mol/m2 day ~ 14.01 Mol/m2 day, direct transmission range of 1.12% ~ 1.12%, 5% ~ 50% of the forests direct rate mainly forests direct light environment in Gutianshan.6. The scattering light diffusing quantity range is 0.7 Mol/m2 day ~ 13.51 Mol/m2 day, scattering rate range is 4.79% ~ 4.79%, 10% ~ 55% of the forests of the scatter forests scattered light environment, 15% ~ 40% of the forests scattering rate constitute the major of thou farmland mountain forests scattered light environment in Gutianshan.7. Forests total radiation dose range of 1.11 Mol/m2 day ~ 27.20 Mol/m2 day, total radiation rate range is 3.79% ~ 3.79%, 10% ~ 50% of the total transmittance mainly transmitted light environment in Gutianshan.8. The opening of the canopy is less than 55%, the forests are mainly composed of scattered light illumination, the smaller of the opening of the canopy, scattered light dominate, the more obvious;Canopy opening greater than 60%, the understory light to direct light as the main light source, and increases with the opening of the canopy, occupied the main position, the more obvious direct light.9. Canopy structure and light environment showed a certain contribution for maintaining the plant diversity.This study enriched the data of evergreen broad-leaved forest ecosystem of Gutianshan, deepen understanding of in gutianshan canopy structure and provide ideas and methods to the research of forest ecosystem...